<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <p id="name"></p>
    </div>

    <script>
        var obj = {}

        Object.defineProperty(obj, 'name', {
            get:function() {
                return document.querySelector('#name').innerHTML
            },
            set:function(val) {
                document.querySelector('#name').innerHTML = val
            }
        })
        obj.name = 'Jerry'
    </script>
</body>

</html>